CDL Study Blog
Guides, tips, and career advice for CDL applicants.
How to Get Your CDL in 2026: Step-by-Step Guide
A complete walkthrough of the CDL process — from CLP application to passing your skills test and getting your commercial driver's license.
CDL General Knowledge Test: Complete Study Guide
Everything you need to know to pass the CDL General Knowledge exam — 50 questions, 80% threshold, and the key topics the test covers.
CDL Air Brakes Test: What You Need to Know
The Air Brakes knowledge test is required to drive vehicles with air brakes. Learn the key concepts, the L restriction, and how to prepare.
CDL HazMat Endorsement (H): Requirements and Study Tips
The HazMat endorsement lets you transport placarded hazardous materials. Learn what the H endorsement requires, including the TSA background check.
CDL Class A vs Class B: Which One Do You Need?
Understand the difference between CDL Class A and Class B licenses — what vehicles each covers, what tests are required, and which jobs need them.
CDL Tanker Endorsement (N): Requirements and Test Prep
Learn what the CDL Tanker (N) endorsement covers, which vehicles require it, and the key topics on the Tank Vehicles knowledge test.
CDL Passenger Endorsement (P): Bus Driver Requirements
The CDL Passenger endorsement is required to drive buses and other vehicles carrying 16+ passengers. Here's what the P endorsement test covers.
CDL Knowledge Test Day: 10 Tips to Pass on Your First Try
Practical advice for the day of your CDL written knowledge test — what to bring, what to expect, and how to avoid common mistakes that cost drivers their pass.